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Table 2 Log Acinetobacter VAP incidence per thousand MV days; meta-regression modelsa

From: World-wide variation in incidence of Acinetobacter associated ventilator associated pneumonia: a meta-regression

  Studies reporting as either Acinetobacter species or Acinetobacter baumanii Only studies reporting as Acinetobacter baumanii
Factor Coefficient b 95 % CI p Coefficient b 95 % CI p
Northern European studies (reference group) +0 · 62 −0 · 37 - +1 · 6   +0 · 71 −2 · 43 - +1 · 01  
Geographic region       
 • Mediterranean +0 · 65 −0 · 10 - +1 · 40 0 · 09 +0 · 33 −0 · 67 - +1 · 33 0 · 51
 • Asia +0 · 71 −0 · 42 - +1 · 83 0 · 22 +0 · 05 −1 · 57 - +1 · 66 0 · 95
 • Middle East +1 · 21 +0 · 28 - +2 · 13 0 · 01 +1 · 74 +0 · 20 - +3 · 28 0 · 03
 • Central & South America +0 · 53 −0 · 64 - +1 · 70 0 · 37 +0 · 56 −1 · 05 - +2 · 18 0 · 48
 • USA & Canada −0 · 90 −1 · 76 - -0 · 04 0 · 04 −1 · 15 −2 · 45 - +0 · 15 0 · 08
 • Ungrouped +0.28 −1 · 56 - +2.10 0.77 +0.31 −3 · 36 - +3.98 0.87
 • Multinational +0.64 −0 · 22 - +1.49 0.14 +0.75 −0 · 89 - +2.4 0.36
Traumac +0 · 93 +0 · 26 - +1.59 0 · 007 +0 · 97 +0 · 001 - +1.94 0 · 05
Year of publicationd +0 · 02 −0 · 04 - +0 · 04 0 · 92 +0 · 05 −0 · 02 - +0 · 12 0 · 14
Mode of diagnosise −0 · 26 −0 · 81 - +0 · 28 0 · 34 +0 · 10 −0 · 71 - +0 · 91 0 · 80
Intervention periodf −0.31 −1.4 - +0.78 0.57 +0.22 −1.58 − +2.02 0.81
Acinetobacter baumanii g −0 · 06 −0 · 61 - +0 · 50 0 · 84    
  1. aThis table displays the results of a meta-regression analysis for log Acinetobacter VAP incidence per thousand MV days
  2. bInterpretation. The reference group is the Northern European studies and this coefficient equals the difference in log from 0 (a log equal to 0 equates to a rate of 1. The other coefficients represent the difference in log for groups positive for that factor versus the reference group
  3. cThe co-efficient for trauma represents the increment in log for an ICU having a majority of admissions for trauma
  4. dThe co-efficient for year of publication represents the linear increment in log for each year after 1980
  5. eFor sampling using bronchoscopic versus tracheal sampling
  6. fStudies undertaken during an infection control intervention
  7. gStudies reporting Acinetobacter infections as Acinetobacter baumanii versus reporting as Acinetobacter species or otherwise